- Can you run conduit through ductwork?
- Is a compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system?
- Can electrical wires touch ductwork Ontario?
- What is a plenum box?
- Can a room be a plenum?
- Can you run wire next to ductwork?
- Can a wire touch heat duct?
- What is the difference between a plenum and a duct?
- What’s the purpose of a plenum?
- What makes a ceiling plenum rated?
Your mechanical is correct. Per NEC 300.22(B), you can run conduit in environmental air ducts or plenums as long as it complies with the list of items this code provision allows.
Is a compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system?
Simply stated, the NEC defines a plenum area as, “a compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system.” It also references, “the space over a hung ceiling used for environmental air-handling purposes,” and, “areas beneath raised floors for information
It can’t touch hot air ducts. Cold air ducts it can touch. The reason it cannot touch hot air ducts is because the heat derates the current carrying capacity of the conductor.
Plenum boxes are usually situated on either side of the fan or heat exchanger and have the important function of bringing in, distributing, and removing air. They are the air’s first stop after being heated or cooled and its last stop before going back into your AC, heat pump, or furnace.
Space between the structural ceiling and the dropped ceiling or under a raised floor is typically considered plenum, however, some drop-ceiling designs create a tight seal that does not allow for airflow and therefore may not be considered a plenum air-handling space.
Q. Is it okay to fish electrical wiring through the wood-framed chases built around hvac ducts and chimneys? A. As long as there are no sharp edges in the chase that might physically damage the cable, there’s no code violation if Romex touches metal hvac supply or return ducts.
BuildingHomes wrote: Romex wire cannot be touching ductwork. It would potentially fail an inspection. What is usually done in new construction is just put a piece of insulation in there to seperate them. It can’t touch hot air ducts.
A plenum is an air-distribution box attached directly to the supply outlet of the HVAC equipment that heats or cools the air to make the house comfortable. The ductwork that distributes the heated or cooled air to individual rooms of the house connects to the plenum.
In building construction Plenum is a separate space provided for air circulation for heating, ventilation, and air-conditioning. It is commonly found in the space between the structural ceiling and a drop-down ceiling or under a raised floor.
A plenum ceiling is one that uses the space between the top of the suspended ceiling and the bottom of the floor above to handle air for ventilation. All suspended ceilings are not plenums, some may use HVAC ductwork to move air to returns and diffusers located in the ceiling tiles (a ‘dead’ ceiling).